Vacuum feed system



Marfh 1927 1. 32, J, n.. VAN FELT VACUUM FEED SYSTEM Filed Aug. 3l. 1926 Chrome? camisa Maa za, 1era IWTE STATE JESSE VAN FELT, OF FUI-LEAN, WASHIN'GJTUN'.,

VACUUM FEED SYSTEM.

Application filed August 31, 1926. Serial No. ll.,

My present invention relates to an improved vacuum feed system of the type employing a vacuum supply tank or reservoir` and carbureter, for internal combustion englues. The primary object of the invention is the provision of a simple and compact ar' rangement of the fuel feeding system by means of which the supply of liquid fuel to the vacuum supply tank may automatically be controlled from the engine cylinders and by the cci-operation of atmospheric pressure, and the outlet and feed of liquid fuel from the carbureter to the engine cylinders is also controlled by suction from the engine cylinders-v Means are also provided whereby an auxiliary supply of fuel may he drawn from the carhureter and introduced into the cylinders while the normal supply of fuel is cut ott and the engine is idling.

'lhe invention consists in certain novel combinations and arrangements of parts for accomplishing the above and other objects as will hereinafter be more fully pointed out and claimed.

ln the accompanying claims I have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and arranged according to the best mode l have thus far devised for the practical application of the principles of my invention. i

Figure l is a vertical sectional view of the device showing the communicating vacuum tank and carbureter and operating parts, and Figure 2 is a detail sectional view at line 2 2 of Figure 1.

ln cafrr ing' out my invention the vacuum tank or oat chamber 1 and the carburetor or gasoline chamber 2 are fashioned in a single casting having a vertical. artition 3 separating the chambers, and a ap valve 4 controls communication between the chambers through the port 5 located near the bottom of the partition. By this compact and close arrangement of parts the level of gasoline in the Heat chamber or vacuum tank' and in the carbureter or feed chamber is maintained at all times on an equality through the action of the valve l.

The open top of the vacuum tank is closed by means of a top plate G'secured as by screws to the walls of the tank, and the carbureter, at its top, is closed by means of the flat plate 7 of the angular air tube 8, screws also being employed to secure the plate T to the walls of the carbureter chamber.

The supply of gasoline to the float chamber of the vacuum tank is drawn from the usual gasoline supply tank through the nipple 9 and inlet chamber 10, in which chamber is. located a cylindrical screen l1 surrounding the ported valve-plug 12 in which 1s. fashioned the seat for the lioatco1itrolled needle valve 13.

Directly above the gasoline inlet to the vacuum tank is provided a nipple 14g supported in the top plate 6 and an arched vent pipe 15, open to the atmosphere exterior of the vacuum tank, is connected to the nipple, which latter is fashioned at its `lower end, within the vacuum tank with a seat for the vent` valve 16 formed at the upper end of the stelnof lthe gasoline valve 13. The seats for the gasoline and vent valves are vthus alined and spaced apart in such manner that the valves on the opposite ends of the stem are always in different positions with relation to their seats. When the gasoline valve is closed as in Figure 1 the vent valve is open to the atmosphere, and vice versa.

ln the top plate 6 of the vacuum tank a nipple 17 is secured, and connected by the suction pipe 18 to the intake manifold of the engine, and at its lower end, Within the vacuum tank, `.this nipple is fashioned With a valve seat for co-operation with the suction neeldle valve 19 located Within the vacuum tan I The three valves 13, 16, and 19, are controlled by 'the action of the float 20 in the vacuum tank 1, which doet is provided with a slotted lever arm 21,y pivoted at 22, in a bracket depending fromthe inner or underside of the plate 6, and the lever arm is provided with an endfork 23 loosely engage ing the double-flanged collar'24 on the stern of the gasoline and vent valves. The lever arm is connected With'the suction valve by means of a sring plate 25 attached at the upper side o the arm, and the free end of this spring plate is forked as at 26 to engage under `the collar 27 fixed on the suctionvalve stem. rlhe lower end of this stemy prom jects downwardly through the slotted lever arm, and a transversely disposed pin'28 is fixed .in the stem below the arm to co-act with the spring plate in the control of the suction valve 1 ,i

When the vacuum tank is filled to the desired level, as in Figure l, the gasoline valve 13 and the suction valve 19 are closed, While the vent valve 16 is open to the atmosphere.

` `When the supply oit gasoline in the vacuum tank is diminished and the level ot the liquid falls, the float descends and causes the vent valve to close and the gasoline valve to open to permit dow of gasoline from the gasoline supply tank to the vacuum tank. The suction valve 19 is also opened by the descent of the Hoat through the co-action of the arm 2l and in 28. 'lhe spring 25 however, is designe to sustain the suctien valve in closed position, and to retard its opening movement, during the initial 'telling movement of the float, thereby permitting the level ot gasoline in the vacuum tank to fall to a limited distance before the suction becomes operative to refill the vacuum tank with gasoline. The spring 25 resiliently supports the valve in closed position until the va 7e is positively opened by the co-action of the slotted leverarm andthe pin 28 of the valve stem. ln this manner the gasoline in 'the vacuum. tank is replenished at less frequent intervals than would be the case were the suction valve immediately opened upon initial movement of the float,- and a large supply, rather than a small supply, of gasoline is :ted to the vacuum tank.

The lfuel supply is .drawn -trom the carbureter chamber through the Venturi. nozzle 29 oi the valve tube 30, the latter being secured in the top plate 7 ot the carbureter and depending into thegasoline supply, and the :former projecting upwardly into the angular air tube 8. A manually adjusted needle valve 3l is located within and coacts with a valve seat in the upper end of the valve tube 'for controlling the leed of fuel through the 'Venturi nozzle and the air and gas are mingled as they pass through the screen 34 andy past the throttle valve 35 to the intake manifold. The fuel valve 3l is supported at 32 in the bottom of the carbureterand may readily be adjusted 'from lthe exterior of the carbureter.

The usual choke valve 33 is located in the angular air tube for controlling the admission of air to the fuel for mixture therewith, and like the throttle valve, is con trolled from the dash board of an automobile or similar vehicle employing the mener? motor that is fed withiuel from the vacuum :feed system.

An idling valve 36 is used to control passage of fuel through the port 3? located in a wall of the angular tube 8 and opening to the interior oit the tube above the closed or partially closed throttle valve. A. by-pass or passage 38 extends downwardly throughthe wall from the port and at the lower end 0f the passage a vertically arranged pipe 39 is secured. The lower end ot' the pipe is submerged below the level of the gasoline in the carbureter, and the gasoline for idling is thereby provided to furnish vapor, which may be diluted with air passing the partially closed throttle, while the main supply of fuel is out. od b the throttle valve. 'lhe valve 36 may be a justed for controlling the passage of vapor through 'the port 37 for idling, and this auxiliary 'supply is drawn to the cylinders by suction in usual manner.

Having thus fully describedlniy invention, what l claim as new and desire to secure by Letters Patent is l. The Combination with a vacuum tank having alined, spaced, ports and valve seats therefor and a suction valve seat and port, of a stem having heads thereon forming a gasoline valve and a vent valve for coaction with the alined seats, a valve tor the suction valve-seat and a stem thereon, a lloat having a lever arm pivoted in the tank and co-acting vwith said headed-stem, a pin in the suction valve-stem 'for co-action with the lever arm, and a spring plate on said arm for coaction with the last mentioned stem.

2. The combination with a carbureter having a it'eed chamber and an air tube hav ing an integral plate closing said chamber, of a valve 'tube in said plate opening into the air tube and feed chamber and a fuel valve in said tube, the wall of the air tube having a ported by-pass and an idlingvalve controlling the ported by-pass, and an idling pipe secured in the 4plate and communicating with said lay-pass and the interior of the feed chamber.

ln testimony whereof l atnx my signature.

JESSE L. VAN FELT. 

